Chemistry
Bex
18

what is the mass percent of carbon, hydrogen, nitrogen, and oxygen in caffeine, C8H10N4O2.

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(1) Answers
Maryanne545

M(C₈H₁₀N₄O₂)=194.193 g/mol w(C)=8A(C)/M(C₈H₁₀N₄O₂) w(H)=10A(H)/M(C₈H₁₀N₄O₂) w(N)=4A(N)/(C₈H₁₀N₄O₂) w(O)=1-{w(C)+w(H)+w(N)} w(C)=8·12.011/194.193=0.4948 w(H)=10·1.008/194.193=0.0519 w(N)=4·14.007/194.193=0.2885 w(O)=0.1648

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